CVE-2026-34909

Ubiquiti Inc UniFi OS ServerActively Exploited (CISA KEV)CVSS 10.0KEV0-Day

Actively exploited (CISA KEV) - patch before 2026-06-26

Ubiquiti UniFi OS contains a path traversal vulnerability which could allow a malicious actor with access to the network to access files on the underlying system that could be manipulated to access an underlying account.

Actively exploited in the wild and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No distribution fix is listed yet; apply vendor mitigations and monitor.

Recommended action: No fix is published yet for an actively-exploited flaw. Apply vendor mitigations, restrict exposure, and watch for a patch.

CVE-2026-34909 Ubiquiti Inc UniFi OS Server Actively Exploited (CISA KEV)

Severity metrics

CVSS 3.1 : 10.0 CRITICAL

Attack vectorNetwork (remote)

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeChanged

Confidentiality impactHigh

Integrity impactHigh

Availability impactHigh

Vector: AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected & fixed versions by distribution

Versions are the native distribution strings (backport-aware): RHEL/Debian/SUSE backport fixes, so compare with the distro version comparator (dpkg / rpm / vercmp), not the upstream version.

No affected package in the tracked watchlist yet (Debian, Ubuntu, Arch, SUSE, Red Hat...). Triage may still be pending.

Sources

Advisory NVD CVE.org

Published 2026-06-23 · updated 2026-07-04 · source: CISA Known Exploited Vulnerabilities